Recent advances in commercial biorefineries for lignocellulosic ethanol production: Current status, challenges and future perspectives

Raj, Tirath; Chandrasekhar, K.; Kumar, Anil; Banu, J. Rajesh; Yoon, Jeong–Jun; Bhatia, Shashi Kant; Yang, Yung‐Hun; Varjani, Sunita; Kim, Jun Seok

doi:10.1016/j.biortech.2021.126292

Cited by 121 publications

(48 citation statements)

References 119 publications

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“…Ethanol production from sugar-and starchrich crops is a widespread commercial process, and the use of wood as feedstock has been shown on a demonstration scale (SEKAB, Sweden) [24,25]. While a thermochemical conversion method can depolymerize all of the biomass constituents, the biochemical conversion only depolymerises the cellulose fraction (accounting for around 40% of the biomass in spruce and pine) to the desired end product, ethanol [26]. The hemicellulose is degraded to sugars that cannot be utilized by non-metabolically engineered wild strains of yeast and is mainly found in the liquid phase, while the lignin fraction is recalcitrant to biochemical degradation and is removed as a solid residue [26].…”

Section: Decentralized Wood Fuel Conversion Processesmentioning

confidence: 99%

Emerging technologies for the production of biojet fuels from wood—can greenhouse gas emission reductions meet policy requirements?

Björnsson

Ericsson

2022

Biomass Conv. Bioref.

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The transition from fossil jet fuel to biojet fuel is an important step towards reducing greenhouse gas (GHG) emissions from aviation. To enable such a fuel shift, the Swedish Government introduced a GHG emission reduction mandate of 27% by 2030 for aviation fuel sold in Sweden, forcing fuel suppliers to blend in biojet fuel in fossil jet fuel. A similar policy instrument is being discussed within the EU. Biojet fuels with life cycle GHG emissions 90% lower than those for fossil jet fuel are projected to be available by 2025, which by far exceeds the requirement of 65% lower emissions in the EU Renewable Energy Directive. The purpose of this study was to carry out life cycle assessments for a number of wood-fuel-based production chains near commercialization and to determine whether they meet the Swedish projection and the EU requirement. The study illustrates what can be achieved in a region with high availability of wood fuels and access to heat and power with low GHG emissions. The production chains studied include the production of hydrocarbon intermediates via (i) fast pyrolysis, (ii) hydrothermal liquefaction, (iii) thermal gasification followed by Fischer–Tropsch-synthesis, and (iv) cellulosic ethanol fermentation followed by upgrading of these four intermediates to biojet fuel and other liquid biofuels. The results show that all the production chains studied can deliver biojet fuels with 89–91% lower GHG emissions than fossil jet fuels. Non-fossil hydrogen is required to achieve low emissions in the upgrading of intermediates from fast pyrolysis and hydrothermal liquefaction.

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Section: Decentralized Wood Fuel Conversion Processesmentioning

confidence: 99%

Emerging technologies for the production of biojet fuels from wood—can greenhouse gas emission reductions meet policy requirements?

Björnsson

Ericsson

2022

Biomass Conv. Bioref.

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“…Yaashikaa et al [ 22 ] discussed various sources of agro-industrial waste and different methodologies for its valorization along with life cycle analysis in agricultural circular bioeconomy. Technological improvements in bioethanol production along with its blending mandates and policies worldwide were reviewed by Raj et al [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Lignocellulosic Biomass Valorization for Bioethanol Production: a Circular Bioeconomy Approach

et al. 2022

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Lignocellulosic biomass generated from different sectors (agriculture, forestry, industrial) act as biorefinery precursor for production of second-generation (2G) bioethanol and other biochemicals. The integration of various conversion techniques on a single platform under biorefinery approach for production of biofuel and industrially important chemicals from LCB is gaining interest worldwide. The waste generated on utilization of bio-resources is almost negligible or zero in a biorefinery along with reduced greenhouse gas emissions, which supports the circular bioeconomy concept. The economic viability of a lignocellulosic biorefinery depends upon the efficient utilization of three major components of LCB—cellulose, hemicellulose and lignin. The heterogeneous structure and recalcitrant nature of LCB is main obstacle in its valorization into bioethanol and other value-added products. The success of bioconversion process depends upon methods used during pre-treatment, hydrolysis and fermentation processes. The cost involved in each step of the bioconversion process affects the viability of cellulosic ethanol. The lignocellulose biorefinery has ample scope, but much-focused research is required to fully utilize major parts of lignocellulosic biomass with zero wastage. The present review entails lignocellulosic biomass valorization for ethanol production, along with different steps involved in its production. Various value-added products produced from LCB components were also discussed. Recent technological advances and significant challenges in bioethanol production are also highlighted in addition to future perspectives. Graphical abstract

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“…It is a principal transport fuel, with 102 billion liters produced worldwide in 2021 [8]. Bioethanol from lignocellulosic biomass has immense potential as a transport fuel due to its decarbonization benefits [9]. The two principal sugars in the lignocellulosic biomass structure, glucose and xylose, can be converted to ethanol.…”

Section: Introductionmentioning

confidence: 99%

Sugarcane Bagasse-Based Ethanol Production and Utilization of Its Vinasse for Xylitol Production as an Approach in Integrated Biorefinery

2022

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Biorefinery of sugarcane bagasse into ethanol and xylitol was investigated in this study. Ethanol fermentation of sugarcane bagasse hydrolysate was carried out by Saccharomyces cerevisiae. After ethanol distillation, the vinasse containing xylose was used to produce xylitol through fermentation by Candida guilliermondii TISTR 5068. During the ethanol fermentation, it was not necessary to supplement a nitrogen source to the hydrolysate. Approximately 50 g/L of bioethanol was produced after 36 h of fermentation. The vinasse was successfully used to produce xylitol. Supplementing the vinasse with 1 g/L of yeast extract improved xylitol production 1.4-fold. Cultivating the yeast with 10% controlled dissolved oxygen resulted in the best xylitol production and yields of 10.2 ± 1.12 g/L and 0.74 ± 0.04 g/g after 60 h fermentation. Supplementing the vinasse with low fraction of molasses to improve xylitol production did not yield a positive result. The supplementation caused decreases of up to 34% in xylitol production rate, 24% in concentration, and 24% in yield.

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Recent advances in commercial biorefineries for lignocellulosic ethanol production: Current status, challenges and future perspectives

Cited by 121 publications

References 119 publications

Emerging technologies for the production of biojet fuels from wood—can greenhouse gas emission reductions meet policy requirements?

Emerging technologies for the production of biojet fuels from wood—can greenhouse gas emission reductions meet policy requirements?

Lignocellulosic Biomass Valorization for Bioethanol Production: a Circular Bioeconomy Approach

Sugarcane Bagasse-Based Ethanol Production and Utilization of Its Vinasse for Xylitol Production as an Approach in Integrated Biorefinery

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